Abstract: A wind turbine with hydro-transmission has a tank filled with circulating liquid, a generator disposed beside the tank, a water pump mounted at a top of a stand and multiple blades connected to the water pump. Wind rotates the blades to drive the water pump to draw the circulating liquid up and pouring the circulating liquid over the generator to generate electricity. The generator that needs more maintenance is disposed on the ground and the water pump that needs less maintenance is mounted at the top of the stand. Therefore, construction and maintenance costs as well as footprint of the wind turbine are reduced.

Abstract: These Free Renewable Energy Designs capture the Earth's tidal energy forces. These systems of interconnected modules are capable of capturing and releasing massive amounts of sea water through water control gate(s) located on the barges. Type A design modules are permanently suspended between high tide and low tide levels and converts Earth's tidal energy into electricity by means of bidirectional water driven turbines contained within cylindrical housings located adjacent to the watertight control gate(s), and at the internal connections between the individual modules, and by bidirectional air driven turbines on the air pressure relief vents. Type B design modules are dynamically secured against massive columns with foundations, and are capable of moving freely up and down the columns, thus using gravitational kinetic energy and buoyant kinetic energy to mechanically drive electrical generators between tidal changes.

Abstract: A miniature hydro-power generation system may include a hydro-power generator and energy storage devices. A flow of liquid may be used to rotate the hydro-generator to generate electric power at a generator output. The generator output may be electrically coupled to each of the energy storage devices so that the energy storage devices can be independently charged with the electric power produced by the hydro-power generator. The hydro-power generator and/or the energy storage devices can also supply electric power to a load. The energy storage devices may also be electrically coupled via a series/parallel switch so that at least two of the energy storage device may be switched between a series configuration and a parallel configuration.

Abstract: Inverse magneto hydrodynamics is employed to exploit natural movement of ocean water at coastal facilities using arrays of tubes to channel the water through orthogonal magnetic fields to generate DC voltage. Each such tube houses a plurality of serially arranged hydro-voltaic cells to produce electrical energy without mechanical movement. The tubes are preferably arranged to produce improved land use efficiency as compared to other known renewable energy generating systems such as photo-voltaic and wind turbines. A pumped salt water version is also disclosed.

Abstract: When driven by a variable speed prime mover, a generator system provides relatively constant frequency AC power by independently controlling the main rotor flux rotational speed. The generator system includes an exciter stator that induces current in the exciter rotor windings at a desired frequency and phasing. The exciter rotor windings are electrically connected to and located in a common core as the main rotor windings to provide two-phase excitation current to the main rotor windings. The exciter stator winding is also located in a common core as the main generator stator windings. Excitation is supplied to the exciter stator from an exciter controller, which controls the frequency and phasing of the exciter excitation, based on the rotational speed and rotor position of the generator, to maintain a constant output frequency.

Abstract: The invention relates to methods for controlling a wind turbine connected to the utility grid by detecting status of the utility grid, and controlling one or more rotor blades and/or emitted power to the grid in returning to the operational wind turbine settings of normal grid mode. The invention also relates to a wind turbine and a wind park comprising at least two wind turbines.

Abstract: In a hybrid vehicle of the invention, a hybrid electronic control unit sets a drive point of an engine and torque commands Tm1* and Tm2* of motors MG1 and MG2 in a range of an input limit and an output limit of a battery, in order to satisfy a preset power demand, and sends the engine drive point to an engine ECU and the torque commands Tm1* and Tm2* simultaneously with the input limit and the output limit of the battery to a motor ECU. The motor ECU verifies whether the operations of the motors MG1 and MG2 with the torque commands Tm1* and Tm2* are in the range of the input limit and the output limit of the battery. When the operations of the motors MG1 and MG2 are out of the range of the input limit and the output limit, the motor ECU resets the torque commands Tm1* and Tm2* to make the operations of the motors MG1 and MG2 in the range of the input limit and the output limit and controls the operations of the motors MG1 and MG2 with the reset torque commands Tm1* and Tm2*.

Abstract: Installation for harnessing wave energy, comprising a floating structure (1) that comprises at least one gyroscopic device (5) with a flywheel (6) that can turn by the action of a motor (7) and a generator (10) configured so that when the gyroscopic device (5) is in use, said flywheel (6) is subjected to a pitching torque caused by the motion of the waves that feeds the generator (10), wherein the installation also comprises: means (23, 44) for controlling the motor (7); means (24, 45) for controlling the generator (10); a floating device (25) for capturing data on the waves; means for transmitting the data captured by the data-capturing floating device (25) and for receiving said data in the floating structure (1); a control unit (16) that calculates at least one parameter applicable by the means (23, 44) for controlling the motor (7) and at least one parameter applicable by the means (24, 45) for controlling the generator (10).

Abstract: A permanent magnet machine (PMM) has a kinetic portion electrically coupled to a power conversion portion. Motive power is provided to the kinetic portion by a torque applied to a motive shaft coupled to a prime mover, such as an aircraft engine or an automobile engine. A control circuit includes a switch disposed between the kinetic portion and output feeder cables of the power conversion portion. A first sensor is effective to detect a first fault condition in either the feeder cables or the power conversion portion and a second sensor is effective to detect a second fault condition in the kinetic energy portion. The first sensor is effective to open the switch when a first fault condition is detected and the second sensor is effective to apply a voltage to a winding within the kinetic portion generating an opposing counter torque on the motive shaft where a combination of torque and counter torque exceeds a fracture yield strength of said motive shaft causing it to fracture.

Abstract: A cooling system for a wind turbine is provided. The cooling system includes at least one generator having a plurality of external fins disposed around at least a portion of the periphery of the generator. A shroud is disposed around at least a portion of the generator, and is configured to guide air across the external fins so that said air cools the generator.

Abstract: A power generator includes a magnetic pole rotor in which a plurality of N magnetic pole cores and S magnetic pole cores are arranged alternately at regular intervals and that is rotatably supported, stator coils that oppose the magnetic pole rotor and are wound round pole portions of poles of stator poles so as to generate AC power, full-wave rectifying circuits 18 for respective stator coils, and smoothing circuits that are connected to the output sides of the respective full-wave rectifying circuits. The power generator is so structured as to convert multiphase AC generated electric power into DC electric power. Further, line ends of positive (+) poles at the output side of the smoothing circuits are connected to the input side of rectifiers that make only current in the forward direction pass through, and the output side (+) line ends of the rectifiers are connected to a (+) combination line.

Abstract: The present invention provides a power converter that can be used to interface a generator (4) that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features that allow the power converter to remain connected to the supply network and retain control during supply network fault and transient conditions. The power converter includes a generator bridge (10) electrically connected to the stator of the generator (4) and a network bridge (14). A dc link (12) is connected between the generator bridge (10) and the network bridge (14). A filter (16) having network terminals is connected between the network bridge (14) and the supply network. A first controller (18) is provided for controlling the operation of the semiconductor power switching devices of the generator bridge (14).

Abstract: Slip ring assemblies for controlling pitch of a wind driven blade such as those utilized in wind turbines can include a series of grooves disposed about an outer perimeter of a rotating portion, each one of the grooves comprising a first planar surface intersecting with a second planar surface at an angle of 75 to 105 degrees, and a concavely rounded bottom portion at the intersection of the first and planar surfaces. The rotating portion of the slip ring can be formed of a bronze material and may include a graphite coating. Also disclosed herein are wind turbine assemblies employing the slip ring assemblies.